The total number of diprotic acids among the following is
`H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3)`
`H_(2)CO_(3), H_(2)S_(2)O_(7), H_(3)BO_(3)`
`H_(3)PO_(2), H_(2)CrO_(4), H_(2)SO_(3)`

Explanation

To determine the total number of diprotic acids from the given list, we need to analyze each compound and identify how many acidic protons (H⁺ ions) each acid can donate. A diprotic acid is defined as an acid that can donate two protons per molecule.

Let's go through each compound step by step:

1. **H₃PO₄ (Phosphoric Acid)**:
- Structure: H₃PO₄ has three acidic protons.
- Conclusion: This is a **triprotic acid** (not diprotic).

2. **H₂SO₄ (Sulfuric Acid)**:
- Structure: H₂SO₄ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

3. **H₃PO₃ (Phosphorous Acid)**:
- Structure: H₃PO₃ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

4. **H₂CO₃ (Carbonic Acid)**:
- Structure: H₂CO₃ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

5. **H₂S₂O₇ (Disulfuric Acid)**:
- Structure: H₂S₂O₇ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

6. **H₃BO₃ (Boric Acid)**:
- Structure: H₃BO₃ has three acidic protons.
- Conclusion: This is a **triprotic acid** (not diprotic).

7. **H₃PO₂ (Hypophosphorous Acid)**:
- Structure: H₃PO₂ has one acidic proton.
- Conclusion: This is a **monoprotic acid** (not diprotic).

8. **H₂CrO₄ (Chromic Acid)**:
- Structure: H₂CrO₄ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

9. **H₂SO₃ (Sulfurous Acid)**:
- Structure: H₂SO₃ has two acidic protons.
- Conclusion: This is a **diprotic acid**.

Now, let's summarize the findings:

- **Diprotic Acids Identified**:
- H₂SO₄
- H₃PO₃
- H₂CO₃
- H₂S₂O₇
- H₂CrO₄
- H₂SO₃

Total number of diprotic acids = 6.

### Final Answer:
The total number of diprotic acids among the given compounds is **6**.

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